Summary: Environ. Sci. Technol. 1993,27, 2585-2592
Transport and Fate
Uptake of Gaseous
Flux Experiments
of Reactive Trace Gases in Red Spruce Needles. 1.
Hydrogen Peroxide As Measured in Controlled Chamber
Candls S. Clalborn'~fand Vlney P. Anejas
Laboratory for Atmospheric Research, Department of Civil and Environmental Engineering, Washington State University,
Pullman, Washington 99164-2910, and Department of Marine, Earth, and Atmospheric Sciences, North Carolina State
University, Raleigh, North Carolina 27695-8208
Foliar uptake by plants represents an important sink for
many air pollutants. In this, the first of two companion
papers, a continuous-flow, well-mixedexposure chamber
wasused to studythe fluxesofgaseoushydrogen peroxide
to red spruce saplings. Wall losses were found to be
substantial and highly variable, requiring frequent wall
loss measurements throughout the course of the experi-
ments. No significant difference was observed between
daytime and nighttime lossesof hydrogen peroxide to the
needle branches. The pseudo-second-order reaction rate